11. When you save energy, you not only save money, you also reduce the demand for __________ such as coal, oil, and natural gas and that is a great way to play a part in saving the planet.

A. carbon footprint B. electricity C. fossil fuels D. biogas

12. In India, the demand for __________ has always been more than the supply.

A. shortage B. sources C. slogan D. electricity

13. __________ energy is produced by collecting sunlight and converting it into electricity.

A. Hydro B. Nuclear C. Solar D. Wind

14. There are many available __________ power sources in Vietnam including sun, wind, water, etc.

A. nuclear B. hydro C. renewable D. solar

15. Laos and Cambodia have big plans for building up to 11__________ on the lower Mekong.

A. dams B. slogans C. energy D. coals

16. __________ can be an excellent source of free, renewable energy for poor farmers.

A. Turbine B. Biogas C. Solar panel D. Bulb

17. The government has warned that Britain will face power __________ in the coming winters.

A. coal B. shortages C. slogans D. energy

18. Wind power is one of the earliest __________ sources of energy used by humankind. A. alternative B. polluted C. harmful D. exhausted

19. Nobody can predict exactly when supplies of fossil fuels will be __________ However, we all know they quickly reduce in quantity.

A. installed B. polluted C. harmful D. exhausted

20. Biogas can be used to __________ natural gas in cooking, heating, or electrical generation.

A. use up B. replace C. pollute D. install

21. At this time next week we__________ to work to support the air pollution cutting down campaign.

A. are cycling B. will be cycling C. will cycle D. will be cycled

22. Someone’s carbon__________ is a measurement of the amount of carbon dioxide that their activities produce.

A. footprint B. energy C. effect D. amount

23. Remember to__________ the lights before going to bed.

A. turn on B. stop C. turn D. turn off

24. We will cut down in the use of natural gas because it is __________ and harmful to the environment.

A. available B. abundant C. plenty D. limited

25. Hydro power is__________ because dams cannot be built in certain areas.

A. abundant B. enough C. limited D. unlimited

26. __________ source of energy is the source that can’t be replaced after use.

A. Effective B. Non-renewable C. Renewable D. Natural

27. Which of the following is NOT renewable source of energy?

A. wind B. coal C. hydro D. solar

28. We are looking for cheap, clean and__________ sources of energy.

A. serious B. dangerous C. effective D. efficient

29. By the middle of the 21st century, people in developing countries__________ more renewable energy.

A. used B. have used C. uses D. will be using

30. If we go on__________ electricity, we will have to pay a lot next month.

A. turning on B. widened C. wasting D. increasing